9/11: The F.B.I. Was STEPPING ON THE CIA's "TOES"????

"Another intelligence source said the CIA feared that if FBI headquarters learned of the suspects' arrival in the U.S., it would try to arrest them -- and bust up a sensitive CIA operation to penetrate al Qaeda.

Mihdhar and Hazmi were plotting an attack outside of the United States, the CIA believed, and wanted the FBI to stay clear of them.

"They said it has nothing to do with the FBI, the next attack will be in Southeast Asia," said a source familiar with the details. "They said, 'It's none of your business.'"

Rossini and other FBI counterterrorism agents were furious, according to a knowledgeable source. The FBI is responsible for investigating domestic-based plots.